The Republican has also threatened to seize Greenland, and to use “economic force” against neighbouring Canada.
One of Trump’s fiercest criticisms of the Panama Canal is that it is effectively controlled by China - an accusation Vasquez Morales said was “unfounded.”
“China has no involvement whatsoever in our operations,” he told The Wall Street Journal.
While a Chinese company operates two ports on either end of the canal, the canal itself is run by the Panama Canal Authority.
Vasquez Morales insisted the Panama Canal Authority did not charge US ships higher rates than anyone else.
The only exception to its rules, he added, was that US Navy vessels get priority treatment as part of the agreement struck in the 1970s, allowing them to swiftly travel between the Atlantic and Pacific Oceans.
© Agence France-Presse